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ABSTRACT: Background
Tranexamic acid (TXA) is the most widely used hemostatic agent in surgical patients. However, when used in a high dose, it could cause a seizure in the postoperative period. The exact effector mechanism behind the seizure triggering remains unknown. Therefore, the authors investigated the effects of TXA on the activity of glutamate transporter type 3 (excitatory amino acid transporter 3; EAAT3), which is the main neuronal glutamate transporter type.Methods
EAAT3 was expressed in Xenopus laevis oocytes through mRNA injection. Oocytes were incubated with diluted tranexamic acid for 72 h. Two-electrode voltage clamping was used to measure membrane currents before, during, and after applying 30 µM L-glutamate. Responses were quantified by integrating the current traces and reported in microcoulombs (µC). Results were presented as mean ± SEM.Results
TXA (30 to 1,000 µM) significantly decreased EAAT3 activity. Our kinetic study showed that Vmax was significantly decreased in the TXA group compared with the control group (1.1 ± 0.1 vs. 1.4 ± 0.1 µC, n = 18-23, P = 0.043), but the Km did not significantly change (12.7 ± 3.9 µM for TXA vs. 12.8 ± 3.8 for control, n = 18-23, P = 0.986).Conclusions
Our results suggest that TXA attenuates EAAT3 activity, which may explain its proconvulsant effect.
SUBMITTER: Shin HJ
PROVIDER: S-EPMC7713840 | biostudies-literature | 2020 Jul
REPOSITORIES: biostudies-literature
Shin Hyun-Jung HJ Lee Soo-Young SY Na Hyo-Seok HS Koo Bon-Wook BW Ryu Jung-Hee JH Do Sang-Hwan SH
Anesthesia and pain medicine 20200701 3
<h4>Background</h4>Tranexamic acid (TXA) is the most widely used hemostatic agent in surgical patients. However, when used in a high dose, it could cause a seizure in the postoperative period. The exact effector mechanism behind the seizure triggering remains unknown. Therefore, the authors investigated the effects of TXA on the activity of glutamate transporter type 3 (excitatory amino acid transporter 3; EAAT3), which is the main neuronal glutamate transporter type.<h4>Methods</h4>EAAT3 was ex ...[more]